I am wondering if any other GM is pulling in outside gaming sources like the Kingmaker Toolbox to their own Kingmaker games?
I am using Warhammer's Mighty Empires hex tiles myself to layout the Stolen Lands a hex at a time.
I was tempted to use Warhammer Fantasy Roleplay’s party sheet to help keep the party cohesive, but couldn’t think of what feats or skills would work with the talent sockets without driving myself mad.
I've been using a few things from Hackmaster (primarily "last will & testament" sheets so far, and I'm hoping to use gene-pool method for character stats for future generations, if the game gets that far). I've been pulling ideas for bonus xp from the Profession BP system from Aces & Eights, and using the Family generation system from Oriental Adventures, 1st ed. Also using stat mods for younger characters from Star Wars d20, 1st ed.
Once we get to the Kingdom building phase I may start borrowing from Birthright, and possibly the Vampire: Dark Ages Transylvania Chronicles rules as well for extra political fun.
Just past experiences with other sandbox modules like:
SPI dragonquest: The Enchanted Wood
Northern Sages: Starstone
D&D Companion set: Test of the Warlords
Ars Magicka: Covenants might have some good inspiration.
I keep wanting to blend this with Houses of the Blooded.